member team returned to ohi to inspect a trench the nra had ordered plant operator kansai electric to double the length of the trench after the first onsite inspection in november. crews dug it to 100 meters. representatives of the nuclear watchdog say they will ask kansai electric to shut down the plant if inspectors conclude an active fault runs underneath it. government guidelines ban the construction of key nuclear facilities on active faults. kansai electric executives insist land slips and not a fault caused the fissures below ohi. after friday's inspection, the shik zach shimazaki said they will look for answers. >> translator: we'll carefully analyze what we saw today. it won't be an easy task determining what it is. >> the team of experts will be back at the plant on saturday. then they will meet early next year to produce an assessment based on the results of their inspection. >>> nra experts are checking the ground beneath a number of power plants in this earthquake-prone country. their reports on some of them could keep the facilities off line for the future or forever.